always install NETCONF dependencies from sources under Debian

Merged Andrei Pavel requested to merge 2975-fix-hammer-debian-12 into v2_2

Should fix these errors that appeared in Debian 12:

 E: Package 'libyang-dev' has no installation candidate
 E: Unable to locate package libyang-cpp-dev
 E: Unable to locate package libsysrepo-dev
 E: Unable to locate package libsysrepo-cpp-dev

I would prefer if they were fixed upstream in hammer rather than patching jenkins.

In reality, Debian maintainers never offered these packages. It was just wishful thinking on our part.

distcheck was tested here: You can see that the step where it previously failed is now passing:

Closes #2975 (closed)

Edited by Andrei Pavel

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